... To mitigate PM2.5 emissions is becoming a pressing concern, because these particles pose a threat to public health. Evidence shows that bead-free nanofiber with diameter of <100 nm is more likely to capture the PM2.5, however, currently it is impossible to fabricate bead-free nanofiber with such diameter without introduction of other substances. To fabricate bead-free polyacrylonitrile (PAN) nanof ...